# Print colour checker: agent instructions

Open https://aspectprinting.co.uk/print-colour-check/ in a browser. WebMCP tools register on that page when the browser supports the API. This is a browser interface, not a remote MCP server. No API key is required. Browsers without WebMCP can use the normal visible controls.

## Workflow

1. Call `colour_check_status` with `{}`.
2. Ask the user to choose their file, or use the normal file picker with their permission. Tools do not accept URLs, file paths or file contents. To try the checker without artwork, call `colour_check_sample` with `{}`. It refuses to replace open artwork.
3. Poll `colour_check_status` until `state` is `ready`. Stop and use the visible error message if `state` is `error`.
4. Use `colour_check_options`, for example `{"paper":"coated","view":"side","highlight":true}`. For a PDF, `{"page":2}` selects page two. Wait for a ready result after changing paper or page.
5. Report `flaggedAreaPercent` as the percentage of the current page area highlighted for possible colour changes. It includes white margins. It is not how much the colours change, nor a percentage that cannot be printed. Each PDF page needs a separate check.

## Limits and privacy

PNG, JPEG, BMP, WebP and PDF are supported, up to 20 MB. PDFs may contain up to 500 pages. Processing uses a reduced-resolution preview on the user's device. Tools return settings and summary figures, not filenames, artwork, extracted PDF text or image data. They do not upload, download, place orders, send enquiries or change cookie choices.

The preview estimates ordinary CMYK printing on the selected paper reference. Screens, presses and papers vary. PDF previews do not preserve all spot-ink, transparency and overprint behaviour. This is not a print-ready file check or a physical proof. Do not use it to promise an exact brand-colour match or decide that a special ink is unnecessary.

## Separate business information

If the user asks about printing services, `aspect_printing_service_links` returns catalogue, artwork, delivery, quote and contact links. Consult those pages for current information. Keep this separate from the colour result; no purchase or enquiry is required to use the checker.